People want an "all-in-one" medicine that says for "cold's & flu's" on the label..... I almost never recommend such a product. Many people don't understand that there is nothing magical in the "cold's & flu's" products that actually treats cold's & flu's--they don't understand that these products treat symptoms. Most of the the time an "all-in-one" medicine gives the patient medicines for symptoms that they are don't have (there by unnecessary risk of side effects), or even worse, the medicine may worsen their symptoms or their other health conditions. So, I almost always recommend piece meal products to people.....which people don't like & often ignore my advice, but oh well. I'm not going to pretend that Nyquil will do anything to help them cough up the gunk in their lungs, or that Coricidin will do anything for their nasal congestion, or that Theraflu is the best choice when their only symptom is body aches & felling pukey. Almost all of the combination products have dextromethorphan--which, much of the time people really don't need because if they have a cough its from nasal drainage or because they are coughing up junk. Almost none of the combination products have guaifenesin--which often suits the pt's symptoms better than dextromethorphan. I have on rare occasions recommended a combo product when they pt had all the symptoms, that the ingredients of the combo product would treat, but this pretty rare.
OP: I would most likely make the same recommendations that you made.
My general recommendations:
If the person is suffering from a runny nose & has no health conditions that would be worsened, Benadryl is the cheapest, most effective way to dry it up. (I've heard other pharmacists & doctors recommend Zyrtec, or worse Claritin--these anti-histimines have very little drying action, which is why they are nice for people who take them chronically for allergies and don't want all the 1st generation antihistamine side-effects, but they aren't going to help dry up mucous for someone with a cold.)
Sudafed for nasal congestion, assuming no HBP or other health conditions that would be worsened by this (if so, then I recommend Ocean nasal spray or a neti-pot)
Mucinex or plain robitussin to help them cough up gunk....yeah, I'm aware of the data showing it isn't all that effective, but its not like there are other OTC options. I also tell them to push water or other fluids.
Delsym or Robitussin DM for a mixed cough or a dry cough. Sugar-free versions if they are diabetic (although realistically in the real world, the amount of sugar in the cough syrups is probably not going to have that big of effect for most people with diabetes.)
Vick Vapor rub is an option also for nose/chest congestion.
Tylenol, or if no other contraindications Motrin/Advil for pain/body aches.
Chloraseptic for a sore throat.
Nauzene for pukiness.
Imodium for severe diarrhea, if it seems likely to be caused by a virus and not by food poisoning.
Of course, there is no reason not to recommend whatever generic version of all of the above, that your store is selling. Almost all of the combination products have dextromethorphan--which, much of the time people really don't need because if they have a cough its from nasal drainage or because they are coughing up junk. Almost none of the combination products have guaifenesin--which often suits the pt's symptoms better than dextromethorphan. I have on rare occasions recommended a combo product when they pt had all the symptoms, that the ingredients of the combo product would treat, but this pretty rare.